Having been loaned back to former side Bastia after signing a four-and-a-half year deal with the northern club last January in a €3.5 million switch, Thauvin, 20, trained just once with the Lille squad before refusing to take part in sessions and making clear his desire to go to OM.

The Under-20 World Cup winner, who has signed a five-year contract at the Stade Velodrome, was reportedly unhappy Rudi Garcia, the Lille coach when he agreed to his move, had since been replaced by Rene Girard while their lack of European football -- compared to Marseille's participation in the Champions League group stage -- was also a factor.

After refusing two offers and stating he was "99.9% certain" Thauvin would stay, setting a €15 million valuation on the player, Seydoux finally accepted OM's bid which, with the included bonuses, will match the fee he had demanded.

"I did not break my word. We weren't selling, and I had said that he would stay, unless there was an indecent offer which we couldn't have imagined. It finally came. However, let's not kid ourselves, the victim in this affair is Lille," the 65-year-old said in a club statement before lashing out at Thauvin, who - L'Equipe reported - will now earn €120,000-a-month, nearly triple his salary at Lille.

"Everyone is in agreement to condemn Florian Thauvin's unacceptable attitude," Seydoux added. "We have been subjected to a situation created by the player and his advisor, without scruples nor values, exclusively preoccupied by financial questions. Everyone is free to judge the responsibility of one and the other in this affair."

After clinching the deal a couple of hours before the close of the transfer window, Seydoux's OM counterpart, Vincent Labrune, had stated negotiations between the pair had been courteous and enabled "us to come to this favourable result."